package io;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/*
块读写
 */
public class CopyDemo2 {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("xg.jpg");
        FileOutputStream fos = new FileOutputStream("xg3.jpg");

        byte[] data = new byte[1024*10];//10kb
        long start = System.currentTimeMillis();
        int len;
        while((len=fis.read(data))!=-1){//len 为每次读到的字节个数
            fos.write(data,0,len);
        }
        long end = System.currentTimeMillis();
        System.out.println("复制完毕，耗时"+(end-start)+"ms");

        fis.close();
        fos.close();

    }
}
